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Merlin

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About Merlin

  • Rank
    Proto Star
  1. I have a problem with the Caldwell "Catalogue". It's surely a blatant case of pliagerism .
  2. I had a pair of 20X60 TENTO binoculars. They were very good, but the leather case stank like a barrel of rotting kippers.
  3. It can help if we paint the knobs white, the better that we can see them in the dark.
  4. You might get some useful tips here: https://www.youtube.com/watch?v=8TObET2F-EA .
  5. Telescopic meteors come towards us in the field-of-view. It might have been one, depending on the direction of travel.
  6. My first 'scope consisted of a ex-Gov. biconvex lens from H.W.English in the 1950s. The lens was waver-thin and had a focal length of about 56 inches. I also obtained a heavy, brass, gunsight eyepiece from English. My dad then fashioned a steel tube at his place of work and a simple steel alt-az mounting and tripod. Despite the crudeness of this non-achromat, I was astounded to see the mountains and craters on a first quarter Moon. I don't recall there being much chromatism evident. The magnification was about 50X. That first view, made a twelve-year-old feel like he could travel anywhere in the Universe.
  7. The reason for the humble Plossl giving sharp definition is because it is actually a type of orthoscopic eyepiece - not conforming exactly to the original ortho, but still orthoscopic in being free from the same aberrations that the Abbe ortho is free from.
  8. What is the observational status of America's classic big refractors these days? Are they used for the benefit of advanced amateurs, as I understand is the case for the Mount Wilson 100-inch reflector?
  9. I have the HELIOS "Voyager" zoom monocular. It's a good performer and not expensive.
  10. The Russians designed a binocular for the military that used a mechanical stabilising system. I think an internal gyroscope did the job. Possibly a windup one.
  11. It's also known as a thumb screw.
  12. I sometimes wonder why people build huge binocular reflectors, when they can have the same aperture in a single 'scope with a binoviewer. This would be my choice.
  13. Back in the 1970s, before the exponential light pollution explosion, I was able to see the Pelican and North American nebulae in 8X40 binoculars, from the suburban back garden.
  14. I like my laser pointer for locating sky objects. I have a back problem and the pen avoids having to bend.
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